Hold down the Shift key to alter the behavior of the following commands and tools as indicated.

Image>Adjust>Brightness/Contrast tool: Simultaneously adjust all channels of a composite imageImage>Adjust>Threshold: Adjusting Min also adjusts MaxImage>Zoom>In: Do not enlarge windowAnalyze>Histogram: Display log histogramAnalyze>Tools>Roi Manager (“Add”): Draw and add selectionMacros in Plugin menu: Open instead of runRectangle and Oval selection tools: Force selection to be squareArea selection tool: Add this selection to previous onePolygon selection tool: Shift-click on a node to duplicate itSegmented line selection tool: Shift-click on a node to duplicate itPoint selection tool: Shift-click to add a pointZoom tool: Shift down, then click and drag to zoom to the selection